One of the most convenient features for a magnifying glass is built-in lighting. Many reading magnifying glasses have this feature to allow for reading in the dark while a partner may be trying to sleep. Jewelry and hobby magnifying glasses also sometimes have lighting to improve your view of whatever you may be working on. Magnifying glasses may include anywhere between two and 15 LED lights.

A. The part of a magnifying glass that is damaged most often is the lens itself. If you want a “durable” magnifying glass, look for one with a scratch-resistant lens. This is the most important factor in guaranteeing the longevity of your magnifying glass.

Imagine waves travelling along a cord strung between two points; relative to the line of the cord, the waves can go either left and right, or up and down, or at any angle in between. In the first place, this angle - the polarisation of the wave - will simply depend on the angle at which the cord was plucked. However, if the cord passes through a slit then only the waves which are parallel to the slit will get through unhindered; waves which are exactly perpendicular to the slit will be absorbed entirely. Waves at intermediate angles will get through, but the component of their motion which is perpendicular to the slit will be absorbed and the wave that emerges the other side will be of a reduced size, and polarised in line with the slit.

Jewelry-making magnifying glasses or models specifically intended for hobby use have a hands-free feature. These magnifying glasses have a stand that sits on a desk or table (similar to a desk lamp), allowing you to have both hands free while looking through the lens.

Whether a wave undergoes plane polarisation is therefore a test for a transverse wave. This can be done for visible light using two strips of polarisaing film or for microwaves using a 1 cm metal grid. Two grids at right angles to each other will absorb all of the microwaves - hence microwave sources are surrounded by a fine mesh.

Most light sources produce unpolarised light. This is because they contain billions of electrons that are continually being excited and de-excited randomly (in all directions) and therefore producing billions of photons at all of those randon orientations when they return to lower energy levels.

Light reflecting off water (or any other shiny but non-metallic surface) will be partially polarised; this is because the component of the light which is perpendicular to the surface is inverted by being reflected, and interferes with itself destructively. See polaroid sunglasses.

What we like: Its 4X and 10X lenses are extremely powerful. Lightweight for the size. LED lights are useful in low light.

Most magnifying glasses cost between $2 and $50. A $2 magnifying glass is a basic plastic handheld reading glass. For $20, you can get a mid-range magnifying glass with two lenses and a built-in light. If you spend $50, you can find a deluxe magnifying glass with three or more lenses and as many as 15 built-in lights.

If you’re ready to start shopping for a new magnifying glass, read the following buying guide, which includes reviews of a few of our favorites at the end. Our top pick, MagniPros Horizontal LED Magnifying Glass, is so durable and functional, you might want to buy a few as gifts.

Plane polarisation is the method of allowing only waves orientated in the same direction - only allowing vibrations in one plane.

A. Handheld magnifying glasses are the preferred type for those who use them for reading. They give you the most control, which is important when you’re using it for reading.

Longitudinal waves cannot be plane polarised because the direction of vibration and direction of propagation are the same.Acoustic waves (sound waves) in a gas or liquid do not have polarisation - but all of the electromagnetic waves do.

Some magnifying glasses come with additional accessories to make transporting and caring for them easier. Protective cases and cleaning cloths are just a couple of the accessories available.

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Only transverse waves can be plane polarised because their vibration is perpendicular to the direction of energy travel - you can therefore have this vibration at different orientations.

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If you align two polaroid filters and then steadily rotate one of them you will find that less leght gets through until when you have rotated the second filter 90 degrees no light gets through. As you continue to rotate the filter the amound of light getting through the filter combination will increase until you get to the point when the total rotation of the filter is 180 degrees. When in this position you will have the same amount getting through as you had in the first place.

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Optically active substances actually rotate the polarisation of light passing through them, while birefringent materials refract light by different amounts depending on its polarisation. An example of this is the mineral calcite, which produces clear double images by splitting the incoming light into two streams with complementary polarisations.

These polymer molecules absorb the component of the light with which they are aligned so the light that emerges from the other side will all be polarised in line with the filter. The chance that any single photon will passing through depends on how close its polarisation is to the angle of the polariser - and as the photon orientation is random the absorbtion:transmission will be 50:50.

Adam Reeder is a writer for BestReviews. BestReviews is a product review company with a singular mission: to help simplify your purchasing decisions and save you time and money. BestReviews never accepts free products from manufacturers and purchases every product it reviews with its own funds.

Polarisation is the orientation of vibration perpendicular to the direction of energy travel. It can be measured with a polarimeter.

A magnifying glass contains a lens that’s made into a convex shape in order to better see small objects. Magnifying glasses have plenty of uses, from making it easier to read a book to examining valuables, such as stamps or gemstones. There are a number of options available when it comes to handheld magnifying glasses. It’s important to choose the right one based on your needs and personal preferences

When electromagnetic waves travel through space they do so at all orientations. The direction of energy movement will be at some angle to the path it is travelling; this is what is called polarisation.

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Focal length describes the distance that a magnifying glass can be from an object while still maintaining visual focus. This factor is important to consider when determining what you want to use your magnifying glass for. If you want to use it for building models or other activities that may require tools, you want a longer focal length so the lens doesn’t get in the way of your work. Otherwise, a shorter focal length may suffice.

Some magnifying glasses include multiple lenses in order to deliver more magnification versatility. These magnifying glasses allow you to choose your specific magnification based on your needs at that moment. While some allow you to switch between lenses, others have a split-lens design, with different magnification specs on one piece of glass.

Jan 29, 2024 — Light is polarized when all its waves wiggle at the same angle. Light can become polarized when reflecting off flat surfaces like puddles and pavement.

Working on exactly the same principles as polaroid sunglasses, these are very useful for intensifying colour. They darken blue skies, which without them tend to look washed out in landscape shots, and for cutting out unwanted reflections or, should you wish to, you can turn one round 90 degrees and brighten the skies and enhance the reflections. Photos of objects under water when viewed from the surface can be greatly improved - see illustration.

Field of view refers to the size of the area you can see while looking through the lens of your magnifying glass. Higher magnification powers usually yield smaller fields of view. If you plan to use your magnifying glass for reading, you probably want a larger field of view. Model-building and similar detail-based activities probably require a smaller field of view.

In order for an aerial to receive plane polarised radiowaves it has to be lined up parallel to the electric component of the electromagnetic wave. It will then absorb the energy as it is used to make electrons in the aerial vibrate - like the 'bars' in the illustration above. Remember an aerial wants to absorb the radiation - not allow it to pass through unimpeded.

You will most probably come across polarisation in everyday life within the realms of photography and the choosing of sunglasses.

In the diagram above the lines on the filters represent a 'grid' that the wave components can get through (in the same way as the rope waves) - they do NOT represent the orientation of the chains of molecules that absorb the waves. When you look at a piece of polaroid film you cannot see any lines on it at all!

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When unpolarised light passes through a polarising filter, about half of its energy will be absorbed.The filtering is the result of long polymers in the material, all aligned the same way.

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What we like: Three ultra-bright LED lights. Multiple lenses with different magnification specs. Light to the touch and ergonomically pleasing.

Magnification power reflects how much larger the glass can make any image appear. It’s usually noted by a number followed by the letter X. This describes how many times larger an image appears through the magnifying glass than it appears with the naked eye. Reading magnifying glasses are best if they have a magnification of less than 10X. Models that have magnification of 10X or more are best for situations where you want to see fine details on an object.

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